Posted by
statisticsdoc on
Aug 31, 2006; 2:50am
URL: http://spssx-discussion.165.s1.nabble.com/variables-fro-factor-scores-tp1070665p1070666.html
Stephen Brand
www.statisticsdoc.com
Dan,
Following the procedure that Hector outlined in his reply earlier today,
SPSS will allow you to compute and save factor scores using the SAVE
subcommand under FACTOR. You have some choices about the exact manner in
which the factor score estimates are computed (bear in mind that the scores
are estimates, the estimated scores contain error, and there are different
ways to estimate). Your options are to estimate scores using Regression
(the default), Bartlett, and Anderson-Rubin.
A lot can be said about the different methods, but in a nutshell, regression
estimates assume that the factor scores are normally distributed, while
Bartlett and Anderson Rubin estimates do not. The core idea in regression
estimates is to minimize the discrepancy between the predicted and true
factor scores. The regression method is the most common and is the default
method in SPSS. If you use this estimate method, check to see that the
regression weights resemble the factor pattern, so your estimated factors
have similar conceptual meaning. Anderson-Rubin is a modification of the
Bartlett procedure that seeks to ensure that the estimated factors are
orthogonal.
A case can also be made for simply computing the sum of all the items that
load on a given factor, giving each item unit weight. While this may seem
like a very crude way to estimate factor scores, the case can be made that
factor weights can be quite sample specific, and so a simple linear
combination of items may be more robust than a weighted combination of
items. Check on the internal consistency (Cronbach's alpha) of the
combination.
HTH,
Stephen Brand
For personalized and professional consultation in statistics and research
design, visit
www.statisticsdoc.com
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]]On Behalf Of
danl
Sent: Wednesday, August 30, 2006 11:06 AM
To:
[hidden email]
Subject: variables fro factor scores
Dear friends,
can explain me how can create one variable from factor scores. I know that
Spss have posibilities but I don`t understand.
I read this expresion: variables x was create like factor scores from
variables a, variables b, variables c ...
thanks,
Dan
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